.card{
    width: 30rem;
    height: 30rem;
    text-align: center;
    margin-top: 4em;
    margin-left: 40rem;
    
}
.card-body a{
    border-radius: 1rem;
    background-color: #a0daf5;
    font-family: 华文新魏;
}
body{
    background-color: black;
}